Piston spreader



p 1935; c. E. JOHNSON 2,015,273

PISTON SPREADER Filed Dec. 10, 1954 w'zmw Chafles Edohnson I PatentedSept. 24,1935 1 "2,015,213

UNITED STATES" PATENT OFFICE PISTON SPREADER,

Charles E. Johnson, North Muskegon, Mich., as-

. signor to Scaled Power Corporation, Muskegon,

Mich., a corporation of Michigan Application December 10, 1934, SerialNo. 756,723

4 Claims. (Cl. 309-42) 5 expansion device of simple construction wherebywhereby expansion of the body member 20 is had. 5 the piston may beexpanded to any desired degree The body member 20 is cut away asindicated at and yet when expanded remains flexible at the 25 in orderto give clearance for the piston conskirt. necting rod when the rod isat the side of the Briefly described. my invention consists of a pistonwhere the expander is located.

cylindrical resilient body member having exten- As shown in Fig. 2, ascrew driver may be insions thereon which fit into an axial slot in theSerted in the S t 33 a d the bolt 3 rotatedwall of a piston and means isintroduced within This causes the nut 0 a its conical Wedging saidcylindrical body for expanding the same surface to move toward the headand over the and causing the extensions thereon to move apart 00111081 wdein Su es 3 T ese wedging surthe desired amount by flexible prongs cutfrom faces en h pr 3 n push th arms 15 said resilient body. 2| apart andthus expand the piston to the de- Another advantage resides in theintegral consired degree The p s s ar s truotion of my body member, tprongs arranged as to cause the corners 25 to bite into tendingangularly inward from its walls. The the bolt head and the nut and holde e prongs serve three functions. First, they coa nst r r r m vem nt.

operate with the expanding bolt to expand the I Claim! 'bodymember,second, th y prevent; accidental 1. A spreader of the class describedcomprisrelease of the expanding bolt, and third they Cllrved body memberof Substantially 0Y- form the resilient means of my expanderconlindrical shap vin w p j t n xtendin nected with the body.substantially in parallelism therefrom, integral Other objects andadvanta es will become app i mean extending inwardly r m said yparent asthe description proceeds. lindrical body, said body being free to expandIn the drawing: and contract through said integral spring means, Fig. 1is a sectional view of a piston having my and extension meanscooperatively associated expander applied thereto. with said integralspring means for the purpose Fig. 2 is a sectional view taken along theline described. 2--2 of Fig.3. 2. A piston expander of the classdescribed, Fig.3 is a plan view of Fi 2. consisting of, a substantiallycylindrical body Fig. 4 is a sectional view looking along the line m m rformed of resilient metal, Said ody 4 4 of Fig. 2. v member having aslit therein whereby the said 35 Like numerals refer to like partsthroughout body membe y be expanded, integral Spring the several views.means extending inwardly from the said body Referring to the drawing,numeral l0 dimember, and wedging means associated with said 40 cates apiston having a. slot I l therein. integra Spring means, whereby the ymembe 40 The expanding device consists of a curved body is expanded tothe desired degreemember 20 formed of resilient material and hav- Adevice as set forth in claim 2 in which ing spaced arms or extensions 2|integrally Said integral p g means as mea s thereon formed therewith.These arms have their edges adapted to Prevent movement of the Wedgingsharpened or serrated as indicated at 22 a d means in one direction, forthe purpose described. thus securely engage the sides of the slot ll.See A article of manufacture consisting f. a Figs. 2 and 4. body memberof curved construction having a The body member 20 has triangularlyshaped plurality of portions struck inwardly therefrom, portions 23struck inwardly as shown in Figs. 1, said body member being slit at oneside, arms on 2 and 4. These portions are in two alined planes t dymember adjacent the slotted p t and each of them is adapted t hav a, rwhereby expansion of the body member radially indicated at 24, engagethe conical portion of a causes separation of these arms, and meansexhead and nut of a bolt, as hereafter described. tending axially of thebody member to contact the The lower row of these prongs extendsoppositely inwardly struck portions for the purpose deto the upper rowthereof for a purpose to be later scribed. 55

This invention relates to an expanding device and more particularly to apiston spreader.

It is oftentimes desirable to expand pistons and one main object of myinvention is to provide an described. I

A bolt 30, has a conically shaped surface 2| thereon (see Fig. 2) and isthreaded at 32 in order to receive the conically shaped nut 40 thereon.A slot 33 is formed and receives the adjusting tool CHARLES E. JOHNSON.

